yes you can flash one over the other but if you use a cwm rom you have to make sure your kernel is the same build if its not included.
right now you can only flash ep1w gingerbread mods unless you have a full odin for ee4 or other gingerbread builds.
it gets a little confusing, if your not sure just ask.

Im new to rooting i understand the risks but the benefits outweigh the risk im good with computers but relatively new to smartphone hacking and would like to know how to root my bionic and what would be a good rom to run
Sent from my DROID BIONIC using DroidForums

If you root and intend to install a rom (Th3ory, Liberty, Eclipse), immediately after installing Clockworkmod make a nandroid backup of your virgin system. Do not remove any bloatware prior to making the virgin backup. That way you can always restore back to a stock rooted phone. Good luck.

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